I purchased an 800 off Ebay a year ago. And found that it was having some display issues. So I'm just getting back to this. I was prepared to purchase an OS board from BestElectronics because it contains the Antic and GTIA chips. But Bradley wants to try some other things first. The first thing is to reseat the ram and os cards. And when I pulled them out, I noticed all the jumper wires and piggy backed chips on the OS and one RAM card. Don't recall those on the ones we had in my original 800. A